Change Label text based on CheckBoxList selection in ASP.Net

Hi kelsen1989,

Please take reference to the below code and correct your code.

HTML

<div>
    <p>
        1. Which bloodborne pathogens? (Select all that apply)
        <asp:CustomValidator ID="CustomValidator1" ErrorMessage="*" ForeColor="Red" ClientValidationFunction="ValidatechkQ1"
            runat="server" />
        <asp:CheckBoxList ID="ChkQ1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ChkQ1_SelectedIndexChanged">
            <asp:ListItem Value="a">a. Hepatitis B</asp:ListItem>
            <asp:ListItem Value="b">b. Hepatitis C</asp:ListItem>
            <asp:ListItem Value="c">c. Diptheria</asp:ListItem>
            <asp:ListItem Value="d">d. Tetanus</asp:ListItem>
            <asp:ListItem Value="e">e. HIV</asp:ListItem>
        </asp:CheckBoxList>
    </p>
    <div id="Answer" runat="server">
        <asp:Label ID="lblQ1" runat="server"></asp:Label>
    </div>
</div>

Code

C#

protected void ChkQ1_SelectedIndexChanged(object sender, EventArgs e)
{
    bool aSelected = false;
    bool bSelected = false;
    bool cSelected = false;
    bool dSelected = false;
    bool eSelected = false;
    foreach (ListItem item in ChkQ1.Items)
    {
        if (item.Selected)
        {
            if (item.Value.ToLower() == "a")
            {
                aSelected = true;
            }
            else if (item.Value.ToLower() == "b")
            {
                bSelected = true;
            }
            else if (item.Value.ToLower() == "c")
            {
                cSelected = true;
            }
            else if (item.Value.ToLower() == "d")
            {
                dSelected = true;
            }
            else if (item.Value.ToLower() == "e")
            {
                eSelected = true;
            }
        }
    }

    if (aSelected && bSelected && !cSelected && !dSelected & !eSelected)
    {
        lblQ1.Text = "1";
    }
    else
    {
        lblQ1.Text = "0";
    }
}

Vb.Net

Protected Sub ChkQ1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim aSelected As Boolean = False
    Dim bSelected As Boolean = False
    Dim cSelected As Boolean = False
    Dim dSelected As Boolean = False
    Dim eSelected As Boolean = False
    For Each item As ListItem In ChkQ1.Items
        If item.Selected Then

            If item.Value.ToLower() = "a" Then
                aSelected = True
            ElseIf item.Value.ToLower() = "b" Then
                bSelected = True
            ElseIf item.Value.ToLower() = "c" Then
                cSelected = True
            ElseIf item.Value.ToLower() = "d" Then
                dSelected = True
            ElseIf item.Value.ToLower() = "e" Then
                eSelected = True
            End If
        End If
    Next
    If aSelected AndAlso bSelected AndAlso Not cSelected AndAlso Not dSelected And Not eSelected Then
        lblQ1.Text = "1"
    Else
        lblQ1.Text = "0"
    End If
End Sub

Screenshot